This page shows the different variations of the Książka adresowa from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
This is a simple icon meant to represent an address book. It's a rectangle stood on end with rounded corners and the @ sign in the middle. The right hand side of the book is hatched with short lines to represent the rings that hold the pages inside the binder.